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《Scientia Geographica Sinica》 2000-05
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Agriculture Activity and Sustainable Use of Farmland in Karst Mountain Area

ZHOU You You [1,2] (1.Department of Urban and Resources Sciences,Nanjing University,Nanjing,Jiangsu 210093; 2.Institute of Karst Geology,CAGS,Guilin,GuangXi 541004)  
According to case study and sampling,this thesis researches farmland use in southwest China karst mountain area.The results show that because of the soil layer being too thin and freely aerated as well as waterleakage of the parent layer,the soil fertility reduces distinctly,drought and other natural disasters become more serious,yields strongly depend on chemical fertilizer after long-term improper reclamation and cultivation.On condition that large quantity of chemical fertilizer application,the farmland only keeps about 30% organic matter after about 60 years' cultivation in contrast with the uncultivated land.The yields are highest and very stable whene the rate of reclaimed land is about 20% to 30% and the percentage of forest cover is about 35% to 45%.If the gradient of the original land is steeper than 16° and the soil layer is about 50-80cm thick or thinner,the effect to keep soil water and nutrient by building terraced fields can only relief drought slightly and is not at all the effective way to solve karst drought.Through comprehensive analysis,it is considered that sustainable use of calcic farmland in karst mountain must be based firstly on proper rate of reclaimed land;secondly on proper percentage of forest cover;thirdly on reasonable fertilizer application and lastly on effective soil conservation.The key to realize this aim is to establish eco agricultural system.And the prerequisite for that is to reduce the farm land acreage and population in the area.
【CateGory Index】: F323.2
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